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The Journal of Immunology, Vol 150, Issue 2 367-376, Copyright © 1993 by American Association of Immunologists

ARTICLES

Anergized T cell clones retain their cytolytic ability

C Go, DW Lancki, FW Fitch and J Miller
Department of Pathology, University of Chicago, IL 60637.

CD4+ T cells have been described to have both helper and lytic function. The helper function of Th1 cells in particular can be inactivated by inducing the T cell into a state of nonresponsiveness in which the T cell is no longer capable of producing IL-2 or proliferating in an autocrine way to a conventional antigenic stimulus. To determine whether the lytic ability of Th1 cells can also be rendered nonfunctional upon anergy induction, we induced Th1 clones into a nonresponsive state and tested their ability to lyse target cells in an Ag-specific and MHC class II-restricted manner. We show that cells newly induced into an anergic state were able to lyse target cells nonspecifically. This effect was short-lived and after resting in culture media, the cells regained their ability to lyse target cells in an Ag/MHC-specific manner, and this ability was comparable to normal resting T cells. In contrast, the helper function of these cells remained nonresponsive, and the cells were unable to proliferate or to secrete IL-2 in response to the same antigenic stimulus used for lysis. Therefore, the lytic pathway appears to be regulated separately from the proliferative/lymphokine pathway(s) and is not affected long-term by an anergic stimulus.


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